.xiagu {
				width: 80%;
				height: 80px;
				margin: 0 auto;
				overflow: hidden;
				position: relative;
				margin: 0 auto;
				background: #f3f5f7;
				margin-top: 75px;
}
			
			#tupian {
				width: 4200px;
				height: 400px;
				position: absolute;
				z-index: 1;
				transition: all 1s;
			}
			
			#tupian p {
			    text-align: center;
			    line-height: 90px;
				width: 25.7%;
				height: 400px;
				float: left;
				span{
				    margin-left: 41px;
				}
			}
			
			.jiantou {
				cursor: pointer;
				display: none;
				line-height: 39px;
				text-align: center;
				font-size: 36px;
				font-weight: bold;
				width: 40px;
				height: 40px;
				position: absolute;
				z-index: 2;
				top: 25%;
				background-color: black;
				opacity: 0.5;
				color: #fff;
				text-decoration: none;
			}
			
			.jiantou:hover {
				opacity: 0.3;
			}
			
			.xiagu:hover .jiantou {
				display: block;
			}
			
			#zuo {
				left: 20px;
			}
			
			#you {
				right: 20px;
			}